I was trying to run MongoDB:
E:\\mongo\\bin>mongod
mongod --help for help and startup options
Sun Nov 06 18:48:37
Sun Nov 06 18:48:37 warning:
After installing the MongoDB you should manually create a data folder.
By default MongoDB will store data in /data/db, but it won't automatically create that directory. To create it, do: $ sudo mkdir -p /data/db/ $ sudo chown `id -u` /data/db You can also tell MongoDB to use a different data directory, with the --dbpath option.
For more detailed information go to MongoDB wiki page.